T-square



(N0 M ode l.)

A. WALENTOWITZ.

T-SQUARE.

No. 500,727. Patented July 4, 1893.

WITNESSES: INVENTUH w m l I ATTORNEYS.

ness and length as the head B, and provided and means for locking thesaid bar in differ- UNITED STATES PATENT OFFICE.

ALBERT WALENTOWITZ, OFGUTTENBERG, NEIV JERSEY.

T-SQUARE.

SPECIFICATION forming part of Letters Patent No. 500,727, dated July 4,1893.

Application filed March 10, 1893.

To all whom it may concern.-

Be it known that I, ALBERT WALENTO- WITZ, a citizen of Germany, and aresident of Guttenberg, in the county of Hudson and State of New Jersey,have invented certain new and useful Improvements in T-Squares, of whichthe following is a specification.

This invention relates to improvements in T-squares for draftsmen, andthe object of my invention is to provide a new and improved T-square, inwhich the blade is normally at right angles to the head, but can readilybe adjusted at any angle, either upward or downward and locked in placeso as to facilitate the drawing of inclined lines.

The invention consists in the combination with a head and ablade fixedthereon at right angles, of a bar adjacent to the inner edge of the headand having its ends connected with the opposite ends of the head bylinks,

ent positions on the blade.

The invention also consists in the construc tion and combination ofparts and details which will be fully described hereinafter and finallypointed out in the claims.

In the accompanying drawings, Figure 1 is a plan-view of my improvedT-square, parts being broken out. Fig. 2 is a side-view of the same,parts being broken out. Fig. 3 is a vertical transverse sectional view,the nut being removed, and Figs. 4 and 5 are plan views of the head,showing the adjustment for different angles.

Similar letters of reference indicate corresponding parts.

The blade A is permanently attached at one of its ends to the head 13 atright angles to the same, in the same manner as in an ordinary T-square.A bar 0 of the same thickwith a longitudinal slot 0' extending from thetop to the bottom surface is arranged along the inner edge of the headB. The ends of the bar 0 are connected by fiat metal rods F F of abouthalf the height of the head 13, with the opposite ends of the inner edgeof the head, said rods being hinged to the bar 0 and to the head, and soarranged that one is above the other. A screw D is passed through thelongitudinal slot A of the blade A, and through the slot 0 of the bar 0,and

is provided at its lower end with a head D Serial No. 465,425. (Nomodel.)

and at its upper end with a nut D The bar 0 is provided at each end witha handle knob E on its upper surface.

When the T-square is to be used for drawing lines at right angles to thehead, the rods F F are folded against the inner edge of the head and thebar C is folded against the rods F F and the parts are locked in placeby drawing up the nut D hen lines are to be drawn at an angle to theedge of the drawing board, the nut D is loosened and the bar 0 is turnedon one end or the other of the head, as shown in Figs. at and 5, untilthe blade A is at the desired angle to the bar 0, and then the parts arelocked in place by drawing up the nut D The edge of the bar 0 is restedagainst the edge of the drawing board, to guide the blade in the usualmanner.

The adjustment of the parts is facilitated by the graduated scales onthe edges of the blade A and bar 0. When the bar G is adjusted at anangle, one of the rods F F rests closely against the inner edge of thehead and the other against the edge of the bar 0.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- I 1. In a T-square, the combination, with a head andblade secured thereto, of a bar adjacent to the inner edge of the blade,a link pivoted to each end of the head, the opposite end of each linkbeing pivoted to that end of the bar opposite the end of the head towhich the link is pivoted, and means for locking said bar in diiferentpositions on the blade, substantially as set forth.

2. In a T-square, the combination, with a head and a longitudinallyslotted blade fixed thereon at right angles, of a longitudinally slottedbar adjacent to the inner edge of the head, pivoted links connecting theends of said bar with the opposite ends of said head, a screw passedthrough the slot in the head and the slot in the bar, and a nut on saidscrew, substantially as set forth.

In testimony that I claim the .foregoing'as my invention I have signedmy name in presence of two subscribing witnesses.

ALBERT \VALENTOVVITZ.

Witnesses:

OSCAR F. GUNZ, CHARLES SoHRoEDER.

